On 28 April 2011 22:56, Luke <hazelnusse@gmail.com> wrote:

This sounds like a very sensible approach and is quick and easy to try out using tricontour/tricontourf. You may have to use a very small positive value for the contour level rather then zero to get what you want.

Yes, it is clear what you are trying to do. I think that you shouldn't be concerned with the triangulation, Delaunay or not, as this is at too low a level for what you are attempting. Stick to the high-level data analysis and presentation functions like tricontour and ignore details of the underlying triangulation. If you are having to manipulate a triangulation then you are becoming a computational geometrist - it is a completely valid and interesting thing to do but is probably taking your attention away from your real work.

Ian

I am thinking that perhaps the approach I should be taking should

involve contouring the real part of the eigenvalues which determine

the stability, and then plot the zero-level curve. I'll have to think

about that some more.

This sounds like a very sensible approach and is quick and easy to try out using tricontour/tricontourf. You may have to use a very small positive value for the contour level rather then zero to get what you want.

Is it clear what I am trying to do? If so, do you think the Delaunay

triangulation is the right way to go?

Yes, it is clear what you are trying to do. I think that you shouldn't be concerned with the triangulation, Delaunay or not, as this is at too low a level for what you are attempting. Stick to the high-level data analysis and presentation functions like tricontour and ignore details of the underlying triangulation. If you are having to manipulate a triangulation then you are becoming a computational geometrist - it is a completely valid and interesting thing to do but is probably taking your attention away from your real work.

Ian